Any of various small nematode worms of the order Oxyurida that are parasitic in vertebrates and certain invertebrates, especially Enterobius vermicularis, a species that infests the human intestines. Also called threadworm.
(Animals) a parasitic nematode worm, Enterobius vermicularis, infecting the colon, rectum, and anus of humans: family Oxyuridae. Also called: threadworm
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